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    <title>Document</title>
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<body>
    <script>
    function mapRender(map){
        map.render();
    }
    function GoogleMap(){
    }
    GoogleMap.prototype.render=function(){
        console.log("google渲染")
    }
    function BaiduMap(){

    }
    BaiduMap.prototype.render=function(){
        console.log("baidu渲染")
    }
    mapRender(new GoogleMap());
    mapRender(new BaiduMap());
    </script>
</body>
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